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ACDB

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Originally appearing in Volume V04, Page 976 of the 1911 Encyclopedia Britannica.
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ACDB =lp, where l denotes the length c D of the See also:

rod and p the distance AB through which it has been moved. This distance, as measured by the See also:rolling of the See also:wheel, which acts as a curvometer, will be called the " See also:roll " of the wheel and be denoted by w. In this See also:case p =w, and the See also:area P is given by P =wt. Let the circumfer- A ence of the wheel be divided into say a See also:hundred equal parts u; then w registers the number of u's rolled over, and w therefore gives the number of areas lu contained in the rectangle. By suitably selecting the See also:radius of the wheel and the length 1, this area lu may be any convenient unit, say a square See also:inch or square centimetre. By changing 1 the unit will be changed. Again, suppose the rod to turn (fig. 7) about the end.

End of Article: ACDB

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